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Carpenter, JH. Observations on the Biology and Behavior of Amphicutis

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Carpenter, JH. Observations on the Biology and Behavior of Amphicutis PROCEEDINGS OF THE FIFTEENTH SYMPOSIUM ON THE NATURAL HISTORY OF THE BAHAMAS Edited by Robert Erdman and Randall Morrison Conference Organizer Thomas Rothfus Gerace Research Centre San Salvador Bahamas 2016 Cover photograph - "Pederson Cleaning Shrimp" courtesy of Bob McNulty Press: A & A Printing © Copyright 2016 by Gerace Research Centre. All rights Reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electric or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in written form. ISBN 978-0-935909-16-6 The 15th Symposium on the Natural History of the Bahamas OBSERVATIONS ON THE BIOLOGY AND BEHAVIOR OF AMPHICUTIS STYGOBITA, A RARE CAVE BRITTLE STAR (ECHINODERMATA: OPHIUROIDEA) FROM BERNIER CAVE, SAN SALVADOR ISLAND, BAHAMAS Jerry H. Carpenter Department of Biological Sciences Northern Kentucky University Highland Heights, KY 41099 ABSTRACT room has larger openings over the water to pro- vide more detritus. Cave isopods and mangrove Amphicutis stygobita is the world’s only rivulus fish do not appear to be significant preda- known brittle star species that appears to be a cave tors of A. stygobita. endemic. Pigment is absent in arms and disk. The statement that A. stygobita is a cave This species was discovered by John Winter in endemic is supported by a surprising array of 2009 and described by Pomory, Carpenter, and troglomorphisms including: no body pigment, Winter in 2011. The few individuals available for muted alarm response to light, reduced body size, the current study were collected in January 2011, elongated arm segments, reduced aggregation, January 2013, and June 2013. slow movement (1-2 cm/min primarily with tube Goals of the current study are to: (1) com- feet, rather than by swinging arms forward), and pare Bernier Cave to nearby Lighthouse Cave to extremely slow regeneration rate of 0.03 mm/wk. possibly determine why A. stygobita are found Bernier Cave and its rare cave brittle star deserve only in Bernier Cave, (2) observe interactions be- much more study. tween A. stygobita and two potential predators: cave isopods (Bahalana geracei) and mangrove INTRODUCTION rivulus fish (Kryptolebias marmoratus), (3) com- pare some biological and behavioral traits of The brittle star Amphicutis stygobita was A. stygobita (especially troglomorphisms) to those found by John Winter in 2009 in a cave discov- of other brittle stars and to those of cave dwelling ered by Don Bernier on San Salvador Island, Ba- species in other taxa, and (4) determine culture hamas. John Winter and I collected additional techniques to keep A. stygobita alive and healthy. specimens in January 2011; Pomory, Carpenter, Amphicutis stygobita are difficult to find and Winter (2011) described the brittle star as a and collect because they are: found only in the new genus and new species. Distinctive physical dark, tiny (disk diameter 3-4 mm), and similar in traits include: no pigment in arms or disk, translu- appearance to the detritus on which they are cent layer of skin raised above surface of arms, found. They are challenging to maintain in the small size (disk diameter 3-4 mm), and short arms laboratory because they are susceptible to light, (to 9 mm) consisting of relatively few segments salinity changes, and elevated temperatures, and that are elongated (Fig. 1). they don’t accept food normally eaten by brittle In March 2014, Susan Hottenrott Spark stars. kindly sent me unpublished information regarding Bernier Cave has a lower salinity range a single brittle star specimen collected from (~14-28 ppt) than Lighthouse Cave (~20-36 ppt); Lighthouse Cave by a George Washington Uni- it is rare for an echinoderm to be endemic to such versity class in 1992. She still has the specimen, a low salinity environment. Tidal fluctuations and which she studied extensively, and her detailed tidal flow are less in Bernier Cave, allowing for a drawings and description confirm that it is clearly substrate of detritus and soft mud, and its entrance an A. stygobita. Many subsequent searches by 31 The 15th Symposium on the Natural History of the Bahamas caves without a surface connection to the ocean are called anchialine (Stock et al., 1986). Typical anchialine caves are stratified with a surface freshwater layer from rain water lying over a saltwater layer from the sea, and separated by a halocline layer of mixed fresh water/salt water. Cave divers often swim through several meters of fresh water and halocline to reach the salt water. The anchialine caves on San Salvador Is- land do not have this stratification. Instead, they have salt water or brackish water all the way to the surface. This allows researchers to collect and observe a unique variety of marine cave animals without SCUBA diving. Examples include sever- al new species described from Lighthouse Cave such as the cirolanid isopod crustacean Bahalana Figure. 1. Amphicutis stygobita with metric ruler geracei (Carpenter, 1981), the asselote isopod and detritus. Neostenetroides stocki (Carpenter and Magniez, 1982), and three species of sponges (van Soest George Washington University classes, as well as and Sass, 1981). Another interesting example by my own classes from Northern Kentucky Uni- from San Salvador Island is the remipede crusta- versity, have never found another brittle star in cean Speleonectes epilimnius (Yager and Carpen- Lighthouse Cave. This may indicate that this spe- ter, 1999), described from Major’s Cave; this is cies has been extirpated from the cave, possibly as the only remipede species known to occur at the a result of disturbance from numerous classes that saltwater surface of a cave (hence the name “epi- visit the cave every year. It is also possible that limnius”), rather than several meters deep in strat- the microhabitats in Lighthouse Cave are simply ified cave waters. not as favorable for A. stygobita as those in Ber- Some intriguing questions arose with the nier Cave. discovery of the world’s first cave brittle star. For The discovery of this species is especially instance, does Bernier Cave have unusual quali- noteworthy because it is the only brittle star that ties that allow A. stygobita to live there? And appears to be a cave endemic (Pomory et al. why have we never found A. stygobita in nearby 2011). There are only rare examples of ocean Lighthouse Cave, which my students, colleagues, dwelling species (e.g., Ophioderma longicauda and I have studied nearly every year since 1978? and Ophionereis sp.) finding their way into caves Thus, one of the goals of the current study was to (Pomory et al., 2011). According to Stöhr and compare Bernier Cave to Lighthouse Cave to pos- O’Hara (2013) there are over 2,100 species and sibly determine why A. stygobita are now found subspecies of ophiuroids (brittle stars and basket only in Bernier Cave. stars). Since they live in a large variety of habi- One of my early observations in Bernier tats and are generally photonegative, it is surpris- Cave was that cave isopods, Bahalana geracei, ing that more brittle stars have not been found in are rare there, while mangrove rivulus fish, Kryp- caves. In fact, it seems likely that more brittle tolebias marmoratus (Poey), are fairly common. stars do live in marine caves, but perhaps cave From years of personal observation of Lighthouse divers have not seen or collected these small ben- Cave organisms, I found that both these species thic animals because divers tend to stay off the prey on a variety of animals. Thus, a second goal bottom to avoid clouding the water. of the current study was to observe interactions Limestone caves that are close to oceans between these two potential predators and often contain salt water or brackish water. Those A. stygobita. 32 The 15th Symposium on the Natural History of the Bahamas Several traits are often associated with MATERIALS AND METHODS cave dwellers, especially with obligate cave or- ganisms known as troglobites (or stygobites, if Animal Sampling aquatic). These special traits are called troglo- morphisms (Christiansen, 1962; Romero, 2009). All A. stygobita specimens were collected Familiar examples include loss of eyes and body from dark areas of Bernier Cave (24° 05’ 37” N, pigment; Romero (2009) lists 20 others. It is 7° 27’ 15” W) in shallow water 10-40 cm deep. tempting to think of troglomorphisms as adapta- The few individuals available for this study were tions for living in caves, but in many cases we collected on three trips: 6 January 2011 (15 spec- don’t know how (or if) the characters are actually imens collected, but 7 preserved for type series advantageous in this habitat (Romero, 2009), and and microscopic study); 9-11 January 2013 (n = documentation of adaptation in extremely troglo- 10); and 17 June 2013 (n = 4). Kryptolebias morphic cave animals is difficult (Culver et al., marmoratus fish were collected from Bernier 1995). Nevertheless, it is interesting to examine Cave for fecal studies and predation experiments; what troglomorphisms are found in this first cave collection dates and quantities were: 9-11 January brittle star and possibly support the statement that 2013 (n = 5) and 17 June 2013 (n = 5). We also this is a cave endemic species. Thus, a third goal collected detritus and water samples. Cave iso- of the current study was to compare some biologi- pods (B. geracei) were collected from Lighthouse cal and behavioral traits of A. stygobita (especial- Cave for predation studies; collection dates and ly possible troglomorphisms) to those of non-cave quantities were: 8 January 2013 (n = 6) and 18 dwelling brittle stars and to those of cave dwelling June 2013 (n = 7). More information about Ber- species in other taxa. In order to accomplish this nier Cave and Lighthouse Cave will be covered in third goal it was necessary to pursue a forth the section comparing these two caves.
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